(CNN) – There is still a sliver of hope the underwater autonomous vehicle, the Bluefin-21, will find signs of missing Malaysia Airlines flight MH370. But that hasn't stopped investigators from regrouping, and reconsidering the search.

The underwater search vehicle is on its 10th mission to find the flight's black boxes or any other plane wreckage.

But it's running out of places to look. It has already covered two thirds of the 6-mile radius where those possible black box pings were detected.

In the event that nothing is found once the entire area is searched, Australian and Malaysian officials want to have the next steps already in place.

Investigators are now game-planning their next move and they're considering widening their search, and possibly bringing in new tools to help.

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